Vol. 8, Issue 4 (2019)

Author(s):
Ramya and Chandra M

Abstract:
Aim of the present study was to analyse the bioactive compounds, antioxidant and associated antifungal activity against Phytophthora blight disease of papaya. The bioactive compounds and related antioxidant capacity of methanolic leaf extracts of four medicinal plants viz., Santalum album, Nyctanthes arbor-tristis, Cinnamomum verum and Tridax procumbens infusions were analysed. The antioxidant capacity was estimated by phosphomolybdic method, Ferric Reducing Antioxidant Power (FRAP) assay and DPPH assay. The primary metabolites like carbohydrate, protein, lipid and secondary metabolites like total phenolics, alkaloids, saponins, tannins and flavonoid contents were analysed quantitatively. Protein, phenolics, alkaloid, tannin and saponin contents were high in Santalum album. The flavonoids and carbohydrate contents were high in N. arbor-tristis. The antioxidant activity was high in Nyctanthes arbor-tristis and Cinnamomum verum and low in Santalum album and Tridax procumbens. The antifungal assay showed maximum zone of inhibition in higher concentration of all plant extracts (25µl-100 µl). The results of the present study showed that all the four plants have high potential antioxidant activity to fight against the Phytophthora blight disease of papaya.